Precaution

n.thoughtful, resilienteveryday

What it means

A step taken beforehand to reduce the chance or impact of harm.

Reach for it when naming a preventive action chosen in response to a credible risk

As a precaution, the guide checked every headlamp before sunset.

playful
belt and braces
for deliberately redundant protection in informal British usage
not when This idiom can suggest overcaution and will be unfamiliar to some readers.
everyday
safety step
when instructions need plain, immediately understandable language
not when Safety step narrows the purpose to physical safety and sounds procedural.
professional
contingency
if the measure is a fallback prepared for a possible event
not when A contingency responds after a problem occurs, whereas a precaution may prevent it.
professional
preventive measure
for a planned action intended to stop a problem arising
not when Preventive measure is precise but heavier than precaution in ordinary speech.
professional
safeguard
when an enduring measure protects people or systems
not when A safeguard may remain in place permanently rather than address one occasion.
formal
foresight
when good anticipation itself deserves praise
not when Foresight is a quality of judgment, not the action produced by it.
literary
insurance
for an extra provision that limits loss if events go wrong
not when Readers may mistake this figurative use of insurance for a financial policy.

sensible precaution
Bringing a paper map was a sensible precaution beyond carrying a phone.
extra precaution
The laboratory added an extra precaution during the power interruption.
take a precaution
Take a precaution now by labeling the backup valve clearly.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.